Add test_list command, to enumerate unit and e2e tests.

This uses go/parser and go/ast to analyze all test files in ~1 second.
It only recognizes a few simple structures that the tests all have, and
modifies a few tests to fit expected structure better.

This is part of an effort to ensure all tests have owners, by having a
verify check to catch new tests being added without an owner.

test/e2e/networking_perf.go

@@ -43,12 +43,10 @@ var _ = framework.KubeDescribe("Networking IPerf [Experimental] [Slow] [Feature:
 
 	// A few simple bandwidth tests which are capped by nodes.
 	// TODO replace the 1 with the scale option implementation
-	runClientServerBandwidthMeasurement(f, 1, gceBandwidthBitsEstimate)
-})
-
-func runClientServerBandwidthMeasurement(f *framework.Framework, numClient int, maxBandwidthBits int64) {
 	// TODO: Make this a function parameter, once we distribute iperf endpoints, possibly via session affinity.
+	numClient := 1
 	numServer := 1
+	maxBandwidthBits := gceBandwidthBitsEstimate
 
 	It(fmt.Sprintf("should transfer ~ 1GB onto the service endpoint %v servers (maximum of %v clients)", numServer, numClient), func() {
 		nodes := framework.GetReadySchedulableNodesOrDie(f.Client)
@@ -153,4 +151,4 @@ func runClientServerBandwidthMeasurement(f *framework.Framework, numClient int,
 			framework.Logf("%v had bandwidth %v.  Ratio to expected (%v) was %f", ipClient, bandwidth, expectedBandwidth, float64(bandwidth)/float64(expectedBandwidth))
 		}
 	})
-}
+})